Thread States

Question 1

(6 answers)

What are the different states in the six-state model?

Answer 1

• NEW
  
  • Thread has not yet started
• RUNNABLE
  
  • Thread is runnable (could be running or waiting for a resource)
• BLOCKED
  
  • Thread is waiting to enter a controlled region of code
• WAITING
  
  • Thread is waiting indefinitely for another thread to perform a particular action
• TIMED_WAITING
  
  • Thread is waiting for another thread to perform a particular action up to a specified time
• TERMINATED
  
  • Thread has run and has completed

Question 2

(5 answers)

What are the different Java methods relating to thread states?

Answer 2

• Start
  
  • Moves the thread into the RUNNABLE state
• Run
  
  • Thread begins executing code and either:
    
    • Finishes and moves into the TERMINATED state
    • Moves into the RUNNABLE state if it runs out of its allotted CPU time
• Yield
  
  • Thread gives way to other threads of equal or higher priority, causing the thread to go back into the RUNNABLE state
• Sleep
  
  • Moves the thread into the TIMED_WAITING state
• Join
  
  • Causes the currently executing thread to wait until the thread on which the join is invoked has terminated

Question 3

Draw a diagram of the six-state model.

Answer 3